St Cyprian’s School
PHYSICAL SCIENCES TEST GRADE 10
Magnetism, Electrostatics
April 2021
50 Marks
Examiner: L Schomer
Moderator: J van Loggerenberg
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1. You may consult the Data sheets provided. Please do not write on them.
2. Mathematical instruments may be used.
3. All questions must be answered.
4. Round all your final answers to two decimal places.
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Question 1 (Multiple Choice Questions)
Four options are given as possible answers to the following questions. Each question has
only ONE correct answer. Write only the letter (A-D) next to the question number on your
answer paper.
1.1
A ferromagnetic substance such as iron will …
A be easily magnetized.
B be a good insulator.
C gain electrons to form ions.
D attract tin strongly.
1.2 The following two particles will repel one another by means of an
electrostatic force:
A
a proton and a magnesium ion
B
an atomic nucleus and an electron
C
an electron and a proton
D
a neutron and a proton
(2)
(2)
Page 2 of 4
1.3 A student has determined the charges on various objects. Which of the following
values has most probably been incorrectly measured or calculated?
A
9,6 x 10-19 C
B
6,4 x 10-19 C
C
4,8 x 10-19 C
D
4,0 x 10-19 C
QUESTION 2
(2)
[6]
MAGNETISM
2.1
Draw the magnetic field lines between two bar magnets with their north
poles facing each other.
(2)
2.2
What is meant by the term magnetosphere?
(1)
2.3
What is the bright glow of light visible near the North pole called?
(1)
2.4 When navigating the seas with a compass, one has to take into consideration the
angle of declination. Explain what this means.
2.5. Study the experiment shown below.
2.5.1 Name the independent variable and the dependent variable.
2.5.2 Calculate the missing values to complete the table.
2.5.3 What mathematical relationship can be deduced from this?
`
(2)
(2)
(1)
(2)
[11]
Page 3 of 4
QUESTION 3
ELECTROSTATICS
3.1 State the Law of Conservation of Charge.
(2)
3.2 When a balloon has been rubbed enough times to gain a sufficient negative charge,
it will be attracted to the wall or ceiling. Explain this phenomenon with the help of a
diagram.
(3)
3.3 Two identical spheres with charges as indicated in the diagram are brought closer
together so they touch. Then they are separated again.
3.3.1 What would the charge on each be after separation?
(3)
3.3.2 How much charge was transferred when they touched?
(2)
3.3.3 How many electrons were transferred while in contact?
(2)
3.3.4 In which direction did the electrons move: K to L or L to K?
(1)
[13]
Page 4 of 4
QUESTION 4
COULOMB'S LAW & ELECTRIC FIELDS
4.1 Calculate the force between two objects, one with a charge of -3 µC and the other with a
charge of +7 µC positioned 300 mm apart.
(5)
4.2 Two point charges are brought close together. They are a distance (d) apart and
experience a force (F).
4.2.1 If the distance is now halved, the new magnitude of the force will be
A
4F
B
F
C
½F
¼F
D
(2)
4.2.2 If the distance is tripled, the new magnitude of the force will be
A
F/9
B
F/3
C
3F
D
9F
(2)
4.3 Draw the resulting field pattern between the following pairs of charges.
(6)
4.4 Calculate the magnitude of the electric field 1,5 m away from a positive charge
of 2,1 x 10-9 C.
(5)
[20]
TOTAL 50